成果報告書詳細
管理番号20120000000178
タイトル*平成23年度中間年報 省エネルギー革新技術開発事業 先導研究(事前研究一体型) 二酸化炭素冷媒で作動する圧縮吸収ハイブリッドサイクルの研究開発
公開日2012/4/28
報告書年度2011 - 2011
委託先名パナソニック株式会社 独立行政法人産業技術総合研究所
プロジェクト番号P09015
部署名省エネルギー部
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等
【1】 空調用圧縮/吸収サイクル技術に最適なCO2 吸収液の研究(産業技術総合研究所)
ア)イオン液体の選定および開発
CO2 吸収量が高く、かつ、粘性率が比較的低く、液体の温度範囲が広い、1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)- amide([BMIM][Tf2N], 図1-1 参照)をモデルのイオン液体とし、既存の方法[1]に従い合成、精製した。
イ)イオン液体候補の熱物性計測と推算式作成[BMIM][Tf2N]の単位体積あたりのCO2 吸収量(CCO2)の圧力依存性を5、25、40、60、80 °Cで測定した(図1-2)。CCO2 は圧力に対してほぼ直線的に変化しており、低温高圧で大きい。
また、温度が高くなるほど、加圧による吸収量の変化が小さくなる。CCO2 は圧力(p)の3 次関数で良好に表され、相関係数はほぼ1 であった(図1-2の脚注参照)。これらの式に基づき、広い温度・圧力範囲でCO2 吸収量を推算可能となった。
英文要約Summary of Research and Development in Fiscal Year of H23.
(1) Studies on CO2 absorbents for compression/absorption cycle technology in air-conditioner
a) Development of ionic liquids
 The 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide ([BMIM][Tf2N]) has been selected as a typical model absorbent because of its high CO2 solubility, relatively low viscosity, and wide liquid temperature range.
b) Measurements and estimation of thermophysical properties of ionic liquids
 The solubilities of CO2 in [BMIM][Tf2N] have been determined at 5, 25, 40, 60, and 80C. The volume concentration(C_CO2) of CO2 increased almost linearly with increasing pressure at each temperature. The pressure dependencies of C_CO2 were well represented by cubic equations, which can provide a good estimation of C_CO2 over a wide range of temperature and pressure.
 The enthalpies of [BMIM][Tf2N]-CO2 system have been evaluated by summing the enthalpies of pure components, [BMIM][Tf2N] and CO2, without pressure correction for [BMIM][Tf2N]. The enthalpy change was calculated with reference to the standard point at 0C and 1 atm.
 The viscosities of [BMIM][Tf2N]-CO2 have also been estimated from the good relation with the electrical conductivities. The viscosity decreased with increasing CO2 pressure, more remarkably at lower temperature. It was confirmed that the viscosities of [BMIM][Tf2N]-CO2 are less than ~15 MPa at higher temperatures and pressures beyond 35 degree and 4 MPa.
c) Cycle simulations
 Using a steady-state chemical process simulator, VMGSim, thermophysical properties, densities and viscosities, in pure [BMIM][Tf2N] and [BMIM][Tf2N]-CO2 mixture have been calculated at 3 and 9 MPa at 35-85 C. The viscosities calculated decreased remarkably when CO2 was dissolved, which was in a good agreement with the experimental results.
 The simulations for the heat-pump cycles with pure CO2 have been constructed as a test study. In practical cycle simulations, the selection and optimization of the equations of state and the correlation parameters should be necessarily considered in comparison with the experimental results at certain conditions.
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